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STUDY

MySQL에 대하여 알아보자!

by TCODi 2022. 9. 14.

MySQL?

MySQL은 데이터 소프트웨어입니다. 일반적으로 데이터를 추가하거나 검색, 추출하는 기능을 모두 포함해서 데이터베이스라고 부릅니다.

MySQL은 세계에서 가장 많이 쓰이는 오픈 소스의 관계형 데이터베이스 관리시스템(RDBMS)입니다. MySQL은 PHP 스크립트 언어와 상호 연동이 잘 되면서 오픈소스를 개발된 무료 프로그램입니다. 그래서 홈페이지나 쇼핑몰(워드프레스, cafe24, 제로보드, 그누보드)등 일반적으로 웹 개발에 널리 사용하고 있습니다.

MySQL 설치

MAMP란 웹사이트를 개발할 때 쓰이는 기술 스택인 macOS, Apache, MySQL, pHP 의 약어이자 솔루션 스텍이다
https://www.mamp.info/en/downloads/

MySQL 실행

윈도우 : cs MAMP/bin/mysql/bin
로그인 : mysql -uroot -proot 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.24 MySQL Community Server (GPL)

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
맥 : cd Application/mamp/Library/bin
로그인 : ./mysql -uroot -proot 
gimsangjun@gimsangjun-ui-MacBookAir bin % ./mysql -uroot -proot                           
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.34 MySQL Community Server (GPL)

Copyright (c) 2000, 2021, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

데이터베이스

데이터베이스 만들기

create database [데이터 베이스 이름]; 
mysql> create database sample01;
Query OK, 1 row affected (0.01 sec)

데이터베이스 보기

show databases; 
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sample01           |
| sys                |
+--------------------+
5 rows in set (0.00 sec)

데이터베이스 사용

use 데이터베이스 이름; 
mysql> use sample01;
Database changed

데이터베이스 삭제

drop database [데이터 베이스 이름]; 
mysql> drop database sample02;
Query OK, 0 rows affected (0.01 sec)

테이블

테이블 만들기

create table member ( myMemberID int(10) unsigned auto_increment, youEmail varchar(40) NOT NULL, youName varchar(20) NOT NULL, youPass varchar(20) NOT NULL, youBirth int(20) NOT NULL, regTime int(20) NOT NULL, PRIMARY KEY (myMemberID) ) charset=utf8; 
mysql> create table member (
->     myMemberID int(10) unsigned auto_increment,
->     youEmail varchar(40) NOT NULL,
->     youName varchar(20) NOT NULL,
->     youPass varchar(20) NOT NULL,
->     youBirth int(20) NOT NULL,
->     regTime int(20) NOT NULL,
->     PRIMARY KEY (myMemberID)
-> ) charset=utf8;
Query OK, 0 rows affected (0.03 sec)

테이블 전체보기

show tables; 
mysql> show tables;
+--------------------+
| Tables_in_sample01 |
+--------------------+
| member             |
+--------------------+
1 row in set (0.00 sec)

테이블 보기

desc 테이블 이름; 
mysql> desc member;
+------------+------------------+------+-----+---------+----------------+
| Field      | Type             | Null | Key | Default | Extra          |
+------------+------------------+------+-----+---------+----------------+
| myMemberID | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| youEmail   | varchar(40)      | NO   |     | NULL    |                |
| youName    | varchar(20)      | NO   |     | NULL    |                |
| youPass    | varchar(20)      | NO   |     | NULL    |                |
| youBirth   | int(20)          | NO   |     | NULL    |                |
| regTime    | int(20)          | NO   |     | NULL    |                |
+------------+------------------+------+-----+---------+----------------+
6 rows in set (0.02 sec)

테이블 삭제

drop table 테이블 이름; 
mysql> drop table member;
Query OK, 0 rows affected (0.01 sec)

테이블 데이터

테이블 데이터 추가

INSERT INTO 테이블 이름(필드명) VALUE(데이터) 
NSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('to_before@naver.com', '김상준', '1234', '19940404', '1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('webstoryboy@naver.com','황상연','1234','19990303','1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('thdtjdgml415@naver.com', '송성희', '1234', '19970415', '1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('mo0647@naver.com', '김민정', '1234', '19970530', '1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('tjrwnsrkdtj@naver.com', '김석준', '1234', '19941009', '1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('jwor124@naver.com', '정은비', '1234', '19990303', '1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('kimlh3743@gmail.com', '김이형', '1234', '20011009','1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('leesh3432@naver.com','이영환','1234','19970205','1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('sshin4882@naver.com','박현신','1234','19990303','1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('kkb7528@naver.com','권규비','1234','19990303','1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('piowm123@gmail.com', '문병내', '1234', '19990303', '1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUE('ghkddbwls96@gmail.com', '황유진', '1234', '19990303', '1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('happyham52@gmail.com','이중호','1234','19970731','1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('eodnjs9605@naver.com','김대원','1234','19960530','1234567')
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('wjsqhdus971007@gmail.com','전보연','1234','19971007','1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('noeyheyh@gmail.com','권혜현','1234','19960331','1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('hjkang306@gmail.com','강현지','1234','19990303','1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('sunhey9810@gmail.com', '박선혜', '1234', '19981010', '1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUE('kde66034@gmail.com', '김동언', '1234', '19700101', '1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('praise1109@gmail.com', '이하은', '1234', '19990303', '1234567');
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('oranssy@naver.com', '최진주', '3950', '20010415', '1234567');

테이블 불러오기

SELECT 필드명 FROM 테이븗명 WHERE 조건

전체 데이터 불러오기

예)SELECT * FROM member; 
mysql> SELECT * FROM member;
+------------+------------------------+------------+---------+----------+---------+
| myMemberID | youEmail               | youName    | youPass | youBirth | regTime |
+------------+------------------------+------------+---------+----------+---------+
|          1 | to_before@naver.com    | 김상준       | 1234    | 19940404 |       4 |
|          2 | to_before@naver.com    | 김상준       | 1234    | 19940404 | 1234567 |
|          3 | webstoryboy@naver.com  | 황상연       | 1234    | 19990303 | 1234567 |
|          4 | thdtjdgml415@naver.com | 송성희       | 1234    | 19970415 | 1234567 |
|          5 | mo0647@naver.com       | 김민정       | 1234    | 19970530 | 1234567 |
|          6 | tjrwnsrkdtj@naver.com  | 김석준       | 1234    | 19941009 | 1234567 |
|          7 | jwor124@naver.com      | 정은비       | 1234    | 19990303 | 1234567 |
|          8 | kimlh3743@gmail.com    | 김이형       | 1234    | 20011009 | 1234567 |
|          9 | leesh3432@naver.com    | 이영환       | 1234    | 19970205 | 1234567 |
|         10 | sshin4882@naver.com    | 박현신       | 1234    | 19990303 | 1234567 |
|         11 | kkb7528@naver.com      | 권규비       | 1234    | 19990303 | 1234567 |
|         12 | piowm123@gmail.com     | 문병내       | 1234    | 19990303 | 1234567 |
|         13 | ghkddbwls96@gmail.com  | 황유진       | 1234    | 19990303 | 1234567 |
|         14 | happyham52@gmail.com   | 이중호       | 1234    | 19970731 | 1234567 |
|         15 | noeyheyh@gmail.com     | 권혜현       | 1234    | 19960331 | 1234567 |
|         16 | hjkang306@gmail.com    | 강현지       | 1234    | 19990303 | 1234567 |
|         17 | sunhey9810@gmail.com   | 박선혜       | 1234    | 19981010 | 1234567 |
|         18 | kde66034@gmail.com     | 김동언       | 1234    | 19700101 | 1234567 |
|         19 | praise1109@gmail.com   | 이하은       | 1234    | 19990303 | 1234567 |
|         20 | oranssy@naver.com      | 최진주       | 3950    | 20010415 | 1234567 |
+------------+------------------------+------------+---------+----------+---------+
20 rows in set (0.01 sec)

myMemberID가 6번인 경우

예) SELECT * FROM member WHERE myMemberID = 6 
mysql> SELECT * FROM member WHERE myMemberID = 6;
+------------+-----------------------+-----------+---------+----------+---------+
| myMemberID | youEmail              | youName   | youPass | youBirth | regTime |
+------------+-----------------------+-----------+---------+----------+---------+
|          6 | tjrwnsrkdtj@naver.com | 김석준    | 1234    | 19941009 | 1234567 |
+------------+-----------------------+-----------+---------+----------+---------+
1 row in set (0.01 sec)

email 중에 naver 텍스트를 포함하고 있는 경우

예) SELECT * FROM member WHERE youEmail LIKE '%naver%'; 
mysql> SELECT * FROM member WHERE youEmail LIKE '%naver%';
+------------+------------------------+------------+---------+----------+---------+
| myMemberID | youEmail               | youName    | youPass | youBirth | regTime |
+------------+------------------------+------------+---------+----------+---------+
|          1 | to_before@naver.com    | 김상준     | 1234    | 19940404 |       4 |
|          2 | to_before@naver.com    | 김상준     | 1234    | 19940404 | 1234567 |
|          3 | webstoryboy@naver.com  | 황상연     | 1234    | 19990303 | 1234567 |
|          4 | thdtjdgml415@naver.com | 송성희     | 1234    | 19970415 | 1234567 |
|          5 | mo0647@naver.com       | 김민정     | 1234    | 19970530 | 1234567 |
|          6 | tjrwnsrkdtj@naver.com  | 김석준     | 1234    | 19941009 | 1234567 |
|          7 | jwor124@naver.com      | 정은 비    | 1234    | 19990303 | 1234567 |
|          9 | leesh3432@naver.com    | 이영환     | 1234    | 19970205 | 1234567 |
|         10 | sshin4882@naver.com    | 박현신     | 1234    | 19990303 | 1234567 |
|         11 | kkb7528@naver.com      | 권규비     | 1234    | 19990303 | 1234567 |
|         20 | oranssy@naver.com      | 최진주     | 3950    | 20010415 | 1234567 |
+------------+------------------------+------------+---------+----------+---------+
11 rows in set (0.01 sec)

테이블 데이터

INSERT INTO 테이블 이름(필드명) VALUE(데이터) 
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('to_before@naver.com', '김상준', '1234', '19940404', '04')

테이블 데이터

INSERT INTO 테이블 이름(필드명) VALUE(데이터) 
INSERT INTO member(youEmail, youName, youPass, youBirth, regTime) VALUES('to_before@naver.com', '김상준', '1234', '19940404', '04')

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